Lock-alarm



L. D. MARIA.

LOCK ALARM.

APPLICATION FILED MAY 21, 1921.

1,391,176. Pmwasept. 20,1921.

2 SHEETSSHEET 1- //v vnv f0 5 10/6/ 0am M4 fF/A ITTGRNELI L. D. MARIA.

LOCK ALA'RM.

APPLICATION FILED MAY 21, 1921.

1,391,176, PatentedSeptQ 20,1921.-

v I 2 SHEETS-SHEET 2.

Ll a1 30/ 2? 5i 9 42* AZQZVQL #MW Tran-W5 x PATENT OFFICE,-

' IIUIGI DELLA MARIA; OF IULARE, CALIFORNIA.

- IDGK-ALABM'.

To all -whom it concern;

Be it known that LLUI'GI a citizen of: the United States, -.and resident of Tulane, in theeounty of Tiilare and "State of 3 California, have invented certain new Ian'd useful Improvements inlgck-Alarms, of which thefollowing is a specification.

My invention relates primarily to a alarmflfor attachment to Jocks'of'idoors or any other similar closures in which -a knob or lever ,isused-to operate the lockyand" the object thereofxis tof providelan alarm which willprevent-the openingof'the door or other closure without sounding 'the'alarm.

A further object; is to provide in a device of the above character means forkregulatlng the violence or force with which the alarm is sounded;

A furtheridbj ect .is. to, provide in a vdevice ofjthe above eharacter means whereby the alarm may be rendered inoperative. v

:A further object is toprovide-afdevice of Q the above character which may be attached to any lock of the charaeterset out without materially altering thesame. v

A still further object is to provide means whereby ,my'alarm may be attached to or detached ,"from-ithe handle 6f a' lo'ckwith aa minimume-amount' of trouble and effort.

.Other objects anddadvantages will appear herein andwhile I have shown and will "describe the preferred form '.f my invention it will .be understood-that I donot limit ny- "self to' such preferred form but that various changes and v adaptations may be made therein without departing from the spirit of my invention. v

In the drawings/accompanying and: forming a part hereof:

' Figure 1 isa top plan of my device with the bell removed for clearness 20f illustration, showing'itheldevice in ltsoperatlve position.

refctingmy ice t 'thlo kh iidle.

EBpe'bilcatian of Letters Patent."

formed substantially reversed L-s'ha ped and has pivotally mounted on its free end 12 a stopper 13. in the upper edgeIof which is "formed a step 14 and theiloweredge has formed therein an varcuate space or recess 15 for a purpose hereafter described. Formed near the right hand edge of member 11 are apertures 16, 17 and 18 which-register with rarcuate'slots 19, 20 and 21 formed in plate 8, and a p1nl22 is adapted to be passed through one of said slots into its companion opening 7 in member 11 anddetachably secured therein. Connected at one'end to .pin'22:is a metallic cord, or other flexible connection; .23, the other end of which is connected to the Patented Sept.'20, 1921. Application fled myrzl, 1921. Serial No. 471,323. I

:llOWBI end of lever 24 extendingdownwardly ing :upwardly from edge isa pintle bolt 2 upon which is mountedlalspiralspring 28, it being understood thatthe inner end of spring 28- is secured to said bolt 27. The free .end of sprin'g'28has mounted thereon a: hammer 29, the-lower end of which is adapted to bereceived in the step 14 of the stopper 13 when the device is in its operative position. A strap-30, preferably U-shaped, passes around hammer 29 and has its free end mounted upon .bolta27 and serves to limit the movement ofshammer 29. Another spring 31 is mountedat one siderof and above spring 28 upon pintle bolt 32 and has itsfree end 33 projecting between :pins' 34 and 35 extending upwardly "from thelower edge of member 11 andserves to return said member 11 to itsnormaloperative position as shown in Fig. .1. Anvadditional pin 36 projects upwardly into :member illat theside of phi-3i and provides means increasing. or decreasing the tensionof .said springfll. Formed.Iin the lower .edge I of plate 8 1,8. a rcess'36 near the upper edge of which is pivotally mounted a lever 37 which provides means for rendering the device operative or inoperative as. desired.

'When the lever is in the position showrrin Fig. 1 stopper 13 is held in an OPBIfLtlVG' position, the step 14 engaging the lower end of hammer 29, and when in the position shown in Fig. 2 stopper 13 is permitted to drop out of engagement with said hammer. A spiral spring 38 serves to retain lever 37 in its adjusted position. Mounted upon bolt 9 is a sleeve 39 provided with an angularly extending arm40 on the end of which is pivotally mounted the lower end of ;regu lator 41. Regulator 41 is substantially L-shaped and the lower leg 42 is formed in.

the shape of abeak and extends toward hammer 29. Extending upwardly from the lower :end of hammer 29 iS .a pin 43 which is adapted, when the: alarm is operated,'to be engaged by leg 42 and forced out of the step 14 in stopper 13 to ring the bell. Extending hpwardl ,-.-and then outwardly, fromthe upper e ge' of. plate 8 is a guide member 44 provided with a slot 45 in which isreceived a'screw 46 mounted in the free end of member 41 which provides means for regulating the position of leg 42 to determine the amount of travel of the hammer 29 when the device-is operated. The. farther the free end of member 41 is moved to the right the less travel the hammer 29 will'have before being forced out 'ofthe step in stopper 13 and the'less "distance hammer'29 will travel until stopped by Strap 30, thus lessening the force with which the hammer strikes the bell and reducing the sound. The lower edge of member 44 is graduated and may be numbered' or otherwise marked'to' indicate the volume "of sound-desired. A thumb nut 47 is mounted on the upper end o'f'means 46 and serves to hold member 4lisecurely'inits adjusted position. Extending through plate 8 near the extreme-right hand edge thereof, 4 5 are a plurality of pairs of holes48 by means of wh1ch the securing member 49 is secured thereto by rivets or otherwise. Member 49 has a central arcuate portion 50 serving as a coverfor cord 23 from the alarm to the interior of thelock. I

I In Fig. I have shown my leverrv24' as adapted for attachment to the handle of a lock whenthe'device isportable. In this" form the upper end is made in two halves,

semi-circular in side elevation, one half being hinged to permitthe same to be opened and passed around the handle of the knob outside of the lock, and a set screw is provided to clamp. the same together when 'positioned for use, 4 e It will be noted that by the use of a fiexi- .ble cordj23 it is possible to mount the bell -within any radiusof the lock, in any direction. By slight changes and adaptations it 2. Analarm for locks comprising a base plate spring mounted on said base plate;

of stopper 13 will draw hammer 29 downwardly to the right until pin 43'is engaged by member 42 and forced out of the step 14 when said hammer will be flung to the left by spring 28 to contact with the bell 10. When handle 51 is released spring 31 will return plate 11 to its normal posit on, lever 37' acting to return stopper 14 toits' normal operative position. As shown" in F g; 2,

when lever"37 ismoved to the extreme right stopper 13 will drop'down out of contact with the hammer 29'and preventithebell from sounding.

7 Having described my'invention what 'I claimis:

1. A look alarm comprising a base plate; a spring mounted on said base plate; a hammer on the free endfof said spring; an operating member pivotally' mounted on said base plate; astopper pivotally mounted on the i' endJof-s'aid operating member and adapted to engage said hammer at 'predeterm ned times; means mounted on said base plate to normally hold said stopper in. its operative position and to be moved to render said pivotally mounted on said baseplate adapted tor'elease said hammer from saidstopper;

and means toadjust said'last'means; to vary the travel of said hammerya flexible con 7 stopper inoperative; means to hold s'aid last V ,ineans' in its adjustedposition; a regulator nectionffrom said op'eratingmember to a lock whereby whensaid lock is operated said flexible memberv will operate said operating member;'and a 'bell mounted on said base a hammer mounted on'the free end of said spring; an operating member pivotally mounted at one end on said base plate; a

stopper pivotally mounted on the free end of sald operating'member having a recess therein adapted to receive the free end of sald hammer; a pm extending upwardly fromflthe :free end of'said hammer; a regulating member pivotally mounted onflsaid base, plate and being capable of adjustment radially,' the freefend of said regulating member terminating in a beak, said beak be:

ing adapted to be moved into the path of said pin to release said hammer fromsaid stopper; an adjusting member pivotally mounted on said plate adapted to normally hold said stopper in itsoperative position 7 and to be, moved to release said stopper an inoperative position; a spring mounted operating member; and a bell detachably on said base plate adapted to return said mounted on said base plate adapted to be 10 operating member to its operative-position; sounded by said hammer; and means to a spring mounted on said base plate adapted limit the movement of said hammer.

for holding said adjusting member in. its ad- In witness that I claim the foregoing I justed position; a flexible connection from have hereunto set my hand this 14 day of said operating member to said lock adapted May; 1921 when said lock is operated to operate said LUIGIDELLAMARIA. 

